Goggle lens



- Dec. 8, 1931.

l V. FOSTER GOGGLE LENS Filed March 15, 1929 F/GJ.

INVENTQR yw ATTORNEY Patented. Dec". 8, I931.

UNITED "STATES PATENT OFFICE neon v.

FOSTER, 01" IRONDEQUOIT, NEW YORK, ASSIGNOR TO BAUSCH & LOMB OPTICAL COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK GOGGLE LENS Application filed March .15, 1929. Serial No. 347,349.

field of vision, the lens extends from the nose c of'the wearer to a point rearwardly of the external canthus of the eye so that the chord connecting the ,two ends of the average lens is about 80 millimeters long. Since it is neither practical nor convenient towear corrective spectacle lenses between the eyes. and the protective goggle lenses and since it is necessary for aviators and the like to wear goggles having a wide field of vision, the pursuits of aviation and the like have been largely restricted to persons having emmetropic or normal eyes.

If an attempt is made to provide such a curved goggle lens with a moderate dioptric power, of two or three diopters, for example, by grinding suitable curves on the two surfaces, the resulting lens will be either too short or of such excessive thickness and weight as I to render it impractical.

One of the objects of the present invention is to provide a practical and eflicient goggle lens which will provide a wide field of vision and have dioptric power for the correction of refractive errors of, the eyes of the wearer.

Another objectis tggpirovide a relatively long, curved goggle lens ich is adapted to extend from the nose of the wearer to the external canthus of the .eye and provide protection and refractive correction to the abnormal eyes of the wearer. vThese and other objects reside in certa'in' novel features of construction, ar-

rangement and combination of parts as'will hereinafter be more fully explained and pointed out in the appended claims.

- Referring to the drawings:

1 shows a front view of a blank before the lens has been cut therefrom.

Fig. 2-shows a front view of the completed lens.

Fig. 3 shows a vertical section taken on line 33.

Fig.- 4 shows a horizontal section of the lens in position before the right eye of a wearer. v

One embodiment of my invention is'illustrated in the drawings wherein 10 indicates a major blank of suitable. glass which may be provided with a spherical curve on the convex tersink is formed in the convex side of the blank 10 and a button or disk 11, having a side and a spherical, cylindrical or toric curve on the concave side. A relatively large counhigher refractive index than the blank 10, V

is then fused in the countersink. This composite lens is then ground and polished, after which the lens is cut on the dotted line indicated in Fig. 1 to provide the finished lens' shown in Fig; 2. I

When the finished lens is placed before the eye E, as shown in Fig. 4, the large fused button 11 is brought substantially in front of the eye and provides the necessary dioptric power to correct the refractive error of the abnormaleye. The portions of the lens which are outside of the fused button area have substantially no dioptric power but merely provide protection like the ordinary goggle lens. The fused button area will provide clear, norrather than to-be able to distinctly see objects by side glances. Hence, my improved goggle lens cannot be regarded, strictly, as a bifocal lens, as that term is used in the art.

By way of illustration, one of my improved goggle lenses is 2.46 mm. thick at the nasal end and 1.9 mm. thick at the temporal end,

the chord connecting these two ends being 80.0mm. in length. The countersink in the jacent to its nasal major blank is 46.0 mm. in diameter and its radius of curvature is 128.5 mm. The convex side of the goggle is finished with a spherical curve whose radius is 63.3 min. While a toric surface, whose radi of curvature are 64.81 mm. and 61.98 111111., is ground on the concave side of the lens. The optical center of the fused button 11 is 21.0 Inna. from the nasal edge of the lens, so that when the lens is placed before the eye this optical c-en ter will be positioned substantially in front of the pupil of the eye. These dimensions provide a goggle lens having an area, adapted to be positioned in front of eye, whose diopaxis 180 the other portions of the goggle lens extend from the nose of the wearer to a point rearward of the external canthus of the eye, said blank having a countersink on one surface adjacent the nasal edge of the blank, '8. disk of glass fused .in said countersink to provide an area having dioptric power, said disk having a higher refractive index than said blank, the portions of the lens outside of said area having substantially no dioptric power.

2. A goggle lens comprisinga relatively long curved major blank of glass adapted to extend from the nose of the wearer to a. point rearward of the external canthus of the eye, said blank having a countersink on one surface, a disk of glass fused in said countersink adjacent the nasal ed of the blank to pro-. vide-an area having 'optric power adapted 'to correct the refractive error of the eye of the wearer, the refractive index of said disk.

of the eye tric power is represented as .+1.50D+0.25D,

being greater than that of the major-blank,

power, the A positioned rising a relatively V of glass adapted to 1,ese,ees

tions of said lens outside of said area having substantially no dioptric power, the optical center of said minor member being located between 15 and 30 millimeters from the nasal edge of the lens.

, LEON V. FOSTER.

.canthus of the eye,

said blank having a countersink formed adedge, a minor member fused in sa d countersink to provide an area having dioptrlc power adaptedto correct the refractiveerror of the eye of the wearer, the refractive index of said minor member being greater than that of major blank,-the'por-' v 

